Radiotube



W. B. DRIVER RADIOTUBE Filed June 27, 1929 Dec. 23, 1930.

' wires and due to the fact of the j meme Dec. 23, 1930 UNITED STATESPATENT 10 FFICE wnmua a. mum, or mar omen, NEW mass! micron Applicationam June :7, me. sci-m I0. $14,049.

This invention relates to radio tubes.

It has been customary to make the plate material of radio tuba of solidsheet metal. A more effective operating tube can be secured by using alate material having openings therein. P ain round wire mesh has beenused but such material has developed some unfavorable characteristicsdue to the fact that the wire mesh is composed of round rotruding endsof the wires. A further culty is found in the removal of foreign matterfrom the wire mesh which has a tendency to collect in the interstices ofthe crossed wires and II which has proved detrimental in' correctevacuation of the tube during manufacture and subsequently in effectingthe proper functioning of the tube. One of the reasons for theutllization of a wire mesh plate material is the increased heatradiating qualities over a solid plate.

One of the objects of this invention is to provide a radio tube with-aform of late that will have the combined good qua ities 5 of a solidmetal late and a round wire mesh without any of t e bad qualities ofeither of the two materials.

Still another object of this invention is to provide a plate materialfor radio tubes having a plane surface of uniform thickness and with arelatively large number of openings therein.

Still another object of this invention is to provide a plate materialwherein the ratio of the openings to the solid material can be readilyvaried or controlled to obtain the bestcharacteristics for a particulartube.

A further object of this invention is to provide a radio plate materialhaving a plurality of openings therein and wherein the metallic surfacesare smooth and form plane surfaces having no interstices of crossedwires to 001- lect dirt, which latter hinders the properevacuationof'the tube during manufacture. A further object of this invention is toprovide a smooth solid edge for the plate material formed from the w1remesh and integral therewith to obviate the bad characteristics of theprotruding ends of a wire mesh.

59 Referring to the drawings:

Fi e 1 is a plan view of the plate materiafi a Figure 2 is an end viewof Figure 1.

Figure 3 is an end view of the material without a selvedge edge.

Figure 4 is a view of a radio tube embodyingFmy invention In' carryingout my invention I propose to make the plate 1 from two pieces 0meshma-. 'terial 2 and to weld the free ends to sup rting conductors 3.An alternative methoxii to make the plate 1 of a single piece of mesh 2and to weld same together and to the electrical conductors 3. In aprevious application Serial No. 370,721 filed June 8, 1929, I have morefully described the methodof making and-the form of mesh which I havefound to be advantageous as a plate material. Mesh 2 is a wire meshwhich has been rolled under i re 5 is'a sectional view along the line'5, 5, coking in the direction of the arrows.-

pressure to form the two surfaces of the mesh into plane surfaces andthe wires into substantially the same plane. The mesh 2 preferably hasformed around its edges a solid selvedge of the same thickness and inthe same plane as the mesh. This selvedge is made integral with the meshand from the wires of the mesh itself. Mesh 2 having a smooth metallicsurface has no interstices between crossed wires to collect dirt and canbe readily cleaned and kept cleaned in' the process-of manufacture. Thesolid selvedge edge has the same effect as an edge of a solid piece ofplate material, that is, it does not have the protruding wires of theordinary round mesh aving no such selvedge and therefore will functionmore perfectly.

As the size of the openings may be controlled in the mesh by the degreeof rolling,

the mesh may be made to fit the exact characteristics of any particulartube.

It will thus be seen that I have invented a radio tube having a platematerial ada table to the characteristics of different tu s and whichwill embody the good qualities of both a solid plate material and around wire mesh without the disadvantages of both.

WhatI claim is:

1. A plate for a radio vacuum tube of wire u mesh the metallic surfacesof said mesh being glans surfaoesgthe free edges of said mes having asubstantially solid metallic selved e integral with the wires and in thesame ane as the wire mesh. I v

2. plate for a radio vacuum tube of wire mesh, the wires of said mesh insubstantially the same lane, the surfaces of said mesh be- "ing smootthe free edges of said wire mesh having a substantially solid metallicselvedge integral with the Wires in the same plane as the wire mesh. I

Si ed at Newark in the coun of Essex and tate of New Jersey this 18th ayof May, A. D. 1929.

WILBUR B. DRIVER'

